Stamping machine



May 20, 1941;

H. MQBQLs-rQN STAMPING MACHINE Filed July 26, 1940 2 Sheets-Sheet 1.

jag-z May 20, 1941. H. M. BOLSTON STAMPING MACHINE I Filed July 26,.1940 2 Sheets-Sheet 2 71/ aQW 7rd? Patented May 20, 1941 UNETED STATESPATENT OFFIQE 2,242,505 STAMPING monmn Harry M. Bolston, Revere, Mass.Application July 26, 1940, Serial No. 347,805

3 Claims.

This invention relates to improvements in a stamp-ing machine used inthe stamping of stock from which shoe cutting dies are to be formed.

It is customary in prior practice to stamp certain identifying numbersand letters in the stock from which shoe cutting dies are formed, such anotation serving in certain cases to identify the maker of the die, theowner of the die, thestyle or type of the last for which the shoe partsare to be cut, and the size designation of the particular die. It willbe understood that a large number of dies are required to'include allthe various sizes of shoes which constitute a complete line, and it isnecessary that the dies be clearly and accurately stamped so thatmistakes Will not be made in cutting material with the die. In the priorpractice the figures and letters have usually been stamped individually.

An object of my invention is to provide a stamping machine by which allof the identifying markings required on a particular piece of die stockwill be made at one time in a clear and legible manner.

Specifically, it is an object of my invention to provide a movable headfor a stamping machine having means to removably receive individualmarking dies whereby the particular dies required may be readily set upand easily changed.

A further object of my invention resides in the provision of a rotatablehead associated with the body of the die holder whereby the size markingor other identifying marking may be readily changed by rotating the headafter each operation of the stamping machine which enables the markingof the die stock for a complete set of cutting dies without requiringany handling of the individual dies by the operator of the ma chine.

Further objects and advantages of my improvements will be more readilyapparent from the following description of the preferred embodiment asdisclosed in the attached drawings, in which:

Fig. 1 is a front elevation of chine;

2 is a side elevation thereof;

Fig. 3 is a plan view of the pivoted head of the stamping machine;

Fig. 4 is a. bottom View of the head member shown in Fig. 3;

Fig. 5 is a vertical section on the plane indicated 5-5 in Fig. 3 andshowing in dotted lines the manner in which a die is inserted or removed.from the rotatable head;

the stamping ma- Fig. 6 is a vertical cross-section taken on the plane6--6 in Fig. 5; and

Fig. 7 is a plan view of a portion of the die stock showing the mannerof applying the marking thereto.

The stamping machine includes the usual bed plate In, vertical guiderods l2 and reciprocal head member l4. A base plate I6 is fixed to thebed by the bolts 58 and serves as a mounting for a removable template 23having secured thereto an angle element 22 against which the die stock24 is positioned, as shown in Fig. 2. The template 20 has a slot orgroove 25 engaging an overhanging plate 28 which is fixed to the bedplate by the screws 30, and the template 20 has a groove 32 on the otherside which is engaged by the clamping lever 34 held to the bed plate bythe pivot screw 36. It will be understood that the die stock material 24comes in various widths and the provision of the removable template 20permits the setting up of the stamping machine to take care of any widthof die stock without requiring careful adjustment by the operator sothat the marking will be properly applied.

The head member l4 includes a pivot pin 33 constituting a mounting for apivoted die holder 40 which is normally locked in operative position bythe locking means 42 but may be swung out of position to permit thechange of the marking dies. The die holder 40 has a slot 44 to receivethe individual die members 46,- the upper ends 48 o-f'which are flushwith the upper surface of the pivoted member 49 so that they will bearagainst the abutment plate 50 carried by the stamping head. The diemembers 45 have shoulders resting on a plate 52 fixed by screws 53 tothe die holder 40 as shown in Figs. 4 and 6. A plate 54 is attached byscrews 55 to the member 40 on the other side of the slot 44. The diemembers are squeezed together and tightly held in position by thefollower block 56 fixed by the bolt 58 threaded into a locking clip 60.

A rotatable die carrier 82 is supported by the holder 40 through thepivot pin 64, to the upper end of which is fixed the knurled adjustinghead 66 by the pin 68. An annular ring 10 is secured to the bottom ofthe head 62 by the screws 12 and serves to hold the marking dies 14which are dropped in place as shown in Fig. 5'. The flange 16 serves toretain the dies 14 against upward displacement except when the head isrotated to bring the die beyond the edge 18 of the flange 16 to themarking position. In order to hold the rotatable head in position and toin-.

2 sure that the next die member is brought into correct position, Iprovide an arm 82 pivotally carried through pin 84 on the holder 40' andnormally urged by the spring 86 to engage the arcuate notches 88 of theadjusting head 66 through the roller 90 carried at one end of the lever82.

In Figs. 1 and 2, a plurality of dies 46 are shown assembled and readyto be used for marking, while the rotatable head member has dies 14assembled therein to mark the size designation, the numeral I indicatedat 80 being positioned in alignment with the dies 46. In operation, atemplate 20 is fixed in position in accordance with the particular dieso that the operator merely places the die stock in position against theangle plate 22. Suitable marking die members are assembled in the dieholder 40 as clearly shown in the drawings. The holder is locked inoperative position and the stamping machine is ready for operation. Aseach piece of die stock is marked, the rotatable die carrier is turnedto bring the next desired size marking into position. The operator may,therefore, complete the marking on the die stock for an entire set ofcutting dies before he is required to change the individual dies in theholder and carrier.

I claim:

1. In a stamping machine rality of markings in the die stock for shoecutting dies, die stock positioning means, a vertically reciprocablestamping head having an abutment plate, a die holder pivotally mountedon said stamping head to swing in a horizontal plane beneath saidabutment plate, said holder having a slot to removably receiveindividual die members, means for locking a plurality of die members insaid holder, a rotatable die carrier associated with said die holder, aplurality of die members arranged in a circular row and supported bysaid holder, means for rotating said carrier, means for releasablylocking saidcarrier in position whereby a selected die is brought intomarking position in alignment with the first mentioned dies, all of thedies in marking position being retained against upward displacement bythe abut-' ment plate of the stamping head.

2. In a metal stamping machine, a vertically reciprocable stamping headhaving an abutment plate at the lower end thereof, a marking die formaking a plusto'ck to be operated upon 7 neath said abutment holderpivotally mounted at one end on said stamping head and arranged to swingin a horizontal plane inwardly into operative position beplate oroutwardly into inoperative position, said die holder having a slotadapted to removably receive a plurality of individual marking dies whenswung to inoperative position, said die holder and said dies havingcooperating shoulders to hold said marking dies in position with theupper ends of said marking dies in the same plane as the top surface ofsaid die holder, all of said marking dies being adapted to 1 seatagainst said abutment plate when said die applied to the strikingposition and pressure is face of the marking dies by downward movementof the stamping head.

3. In a stamping machine for marking the die stock for shoe cuttingdies, a vertically reciprocable stamping head having an abutment plateat the lower end thereof, a vertically disposed pivot pin fixed to saidstamping head at one side thereof, a marking die holder pivotallysupported at one end bysaidpivot pin and arranged to swing inwardly, ina horizontal plane into operative position beneath said abutment plate,said die holder having a slot to removably receive a plurality ofindividual marking die members which may be assembled from the upperside of said die holder when said die holder is swung outholder is inoperative 1 wardly to inoperative position, means for retaining saidmarking die members in position with their upper ends in the same planeas the top surface of said die holder, said die holder having anextension at the end opposite to the pivotally supported end, arotatable marking die carrier mounted in the extension of said dieholder, said rotatable die carrier being adapted to removably receive aplurality of individual marking dies retained in position with theirupper ends in the same plane as the upper ends of said first mentionedmarking dies, said rotatable die carrier being adapted to move aselected marking die into position beneath said abutment plate intoalignment with said first mentioned marking die 3 whereby when pressureis applied to the striking faces of said marking dies by an operativestroke of said stamping head all of the dies in striking position willseat against the common abutment plate.

HARRY M. BOLSTON.

